will grado hum?

No problem with a Grado TLZ and an Alphason HR-100S "S" shaped tonearm.

No problem with Grado Blue and S-shaped Vintage Rega Arm.
I say no problem because in order for me to hear Grado hum I have to turn Volume to 3 o'clock, which I would never do while listening.

I have a Grado Ref Sonata, have never used it on an Alphason, or any S shaped arm, but I did have a hum problem when I was using it on a Heybrook Turntable. The problem only occurred when the cartridge approached the center (ie end) of the LP which is nearing where the motor is. My research indicated they pick up hum from AC motors. Using the same cartridge on my other tables (with DC motors) was no problem at all. It's as quiet as any cartridge I've used, and quieter than some.

I've seen this with Regas, but we found that we were able to fix some grounding problems on the Rega and then there was no hum at all.

Atmasphere,

do you recall what exactly you did to the Regas to cure the grounding issue?